Bug 131547

Summary: VIEWING At scroll gaps in displayed text with enabled Skia
Product: LibreOffice Reporter: Stefan_Lange_KA <Stefan_Lange_KA>
Component: WriterAssignee: Not Assigned <libreoffice-bugs>
Status: RESOLVED DUPLICATE    
Severity: normal CC: aron.budea, telesto
Priority: medium    
Version: 7.0.0.0.alpha0+   
Hardware: x86-64 (AMD64)   
OS: Windows (All)   
Whiteboard:
Crash report or crash signature: Regression By:
Bug Depends on:    
Bug Blocks: 129062    
Attachments: zip file with 6 screenshots to show the problem

Description Stefan_Lange_KA@T-Online.de 2020-03-24 18:42:44 UTC 
Created attachment 158955 [details]
zip file with 6 screenshots to show the problem

In LO 7.0 Writer builds from 2020-03-19 and later (=younger) scrolling by scroll bar or mouse wheel results in gaps in the displayed text. The behavior is the same regardless of whether OpenGL is activated or not.
To show the problem I have opened the same text document with the LO builds from 
/daily/master/Win-x86_64@tb77-TDF/2020-03-18_03.49.36/ and from /daily/master/Win-x86_64@tb77-TDF/2020-03-19_04.02.14/
with and without OpenGL activated. I have made screenshots, contained in the attached zip file.
An other text document I have opened with the LO build from 2020-03-24. The both screenshots do show as well the gaps as also the behavior described in Bug 131543.
The gaps do not occur when navigation within the document is made by keybord (cursor keys, page keys etc.).

The problem only concerns the output on the display. The print output and export e.g. to pdf is made correct.

Because of the same "starting date" (both first seen in builds from 2020-03-19) I guess there is a relation to Bug 131543.
Comment 1 Stefan_Lange_KA@T-Online.de 2020-03-24 22:28:47 UTC 
After a comment from V Stuart Foote to Bug 131543 I have checked both bugs, 131543 and 131547, for related settings.
As I have seen the here described problem exists in LO builds starting from 2020-03-19 when Skia is enabled regardless if OpenGL is activated or not.
Comment 2 Telesto 2020-03-25 15:13:05 UTC 
Repro
Version: 7.0.0.0.alpha0+ (x64)
Build ID: 7ae9c9572ccac55c0926b8a9779bb63c4236291c
CPU threads: 4; OS: Windows 6.3 Build 9600; UI render: Skia/Vulkan; VCL: win; 
Locale: en-US (nl_NL); UI-Language: en-US
Calc: CL
Comment 3 Stefan_Lange_KA@T-Online.de 2020-03-25 15:36:58 UTC 
Seems it is a duplicate of Bug 131426.
Comment 4 Aron Budea 2020-03-25 15:51:15 UTC 
(In reply to Stefan_Lange_KA@T-Online.de from comment #3)
> Seems it is a duplicate of Bug 131426.
Yes, I agree, let's dlose as duplicate.

*** This bug has been marked as a duplicate of bug 131426 ***